Changes for page ThingsBoard
Last modified by Dilisi S on 2025/04/02 02:09
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... ... @@ -379,43 +379,13 @@ 379 379 [[image:new-integration-pending.png]] 380 380 381 381 382 -= 5. Verifying the receipt of data from virtualdevices=382 += 5. Verifying the receipt of data from the device = 383 383 384 384 385 - ==5.1Howdoesitwork?==385 +On the terminal, issue the following MQTT command which simulates the device S31B-NB. 386 386 387 -We use the Mosquitto MQTT client to simulate MQTT messages, acting as a virtual device. First, install the Mosquitto client on your computer from [[this link>>url:https://mosquitto.org/download/]]. The Mosquitto client publishes messages to the MQTT broker (HiveMQ) on a specified MQTT topic. ThingsBoard subscribes to these messages using the same topic. 388 - 389 -The Mosquitto client publishes messages on the topic v1/devices/[device_name]/telemetry. The [device_name]placeholder can be replaced with any device name, for example, 'S31B-NB'. Then, the MQTT topic would be v1/devices/S31B-NB/telemetry. 390 - 391 -On the ThingsBoard side, we configure the MQTT topic subscription as v1/devices/+/telemetry. The + wildcard represents any device name and allows ThingsBoard to automatically create (provision) a device with that name, such as S31B-NB, for example. 392 - 393 - 394 -**The new device is created the first time the MQTT topic is received. For subsequent MQTT topics with the same device name, no duplicate devices will be created.** 395 - 396 - 397 -For example, if you send two MQTT messages with different device names in the topic: 398 - 399 -1. v1/devices/**S31B-NB**/telemetry 400 -1. v1/devices/**S31B-CB**/telemetry 401 - 402 -ThingsBoard will create two devices named **S31B-NB** and **S31B-CB** in the **//Devices//** section. 403 - 404 - 405 -The MQTT payload format is as follows, for example: 406 - 407 407 {{code language="none"}} 408 - {"temperature":10.4,"humidity":85}388 +mosquitto_pub -d -q 1 -h mqtt.eu.thingsboard.cloud -p 1883 -t v1/devices/S31B-NB/telemetry -u "24vk3w9h7sqdld1me5eh" -m "{temperature:20}" 409 409 {{/code}} 410 410 411 - 412 -== 5.2 Sending messages == 413 - 414 - 415 -On the terminal, issue the following MQTT command which simulates the device S31B-NB. The message payload contains the fields temperature and humidity, which hold the values 10.4 and 85, respectively. This payload is also (technically) known as telemetry. 416 - 417 -{{code language="none"}} 418 -mosquitto_pub -d -q 1 -h 011731f7928541588a6cdfbbedfc63f4.s1.eu.hivemq.cloud -p 8883 -t "tb/mqtt-integration-tutorial/sensors/SN-001/telemetry" -u "pradeeka" -P "Kalpani123@" -m '{"temperature":10.4, "humidity":85}' 419 -{{/code}} 420 - 421 421 If the integration was performed without errors, after the transmission of the first telemetry, a new device with the name “S31B-NB” will appear in the Devices → All. Also, you can verify the input and output data, respectively, before and after conversion in Data converters → UDP Uplink Converter NB/CB → Events.